Monitoring investigation of solar diffuse fraction in Taiwan

Keh Chin Chang, Chun Tin Lin, Chia Chun Chen

Research output: Contribution to journalArticle

Abstract

Global solar radiation, which passes through the atmosphere and arrives on earth’s ground, is composed of two constituents, that is, beam and diffuse radiation. It is agreed that the beam radiation is the only effective part for use of solar energy in concentrating either photovoltaic or solar thermal energy application, which concentrates the incident sunlight to attain high performance of either electrical power or high-temperature thermal energy generation, respectively. Information of beam radiation quantity incident upon an absorbing surface is, thus, a prerequisite for the performance evaluation of concentrating optic device. However, very few data of diffuse fraction, defined as the ratio of diffuse radiation to global radiation, is available in Taiwan. A long-time monitoring investigation in the main island (Taiwan proper) and one offshore islet (Penghu) were conducted over recent years. It was found that the annually averaged diffuse fractions, calculated with the time duration from sunrise to sunset, in the east (Taitung) and west (Tainan) sides of the main island were about 0.49 and 0.53, respectively, while about 0.50 in the offshore islet (Penghu). Seasonal variations due to geographical/topographical effects on diffuse fraction are also reported and discussed. It is found that Northeast Monsoon has remarkable effects on increment of diffuse fraction in Taitung and Penghu, while insignificant effect in Tainan.

Original languageEnglish
Article number439
JournalOptical and Quantum Electronics
Volume50
Issue number12
DOIs
Publication statusPublished - 2018 Dec 1

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Taiwan
diffuse radiation
Radiation
Monitoring
concentrating
thermal energy
Thermal energy
sunrise
sunset
monsoons
solar energy
radiation
sunlight
annual variations
solar radiation
Solar radiation
Solar energy
optics
Optics
atmospheres

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering

Cite this

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Monitoring investigation of solar diffuse fraction in Taiwan. / Chang, Keh Chin; Lin, Chun Tin; Chen, Chia Chun.

In: Optical and Quantum Electronics, Vol. 50, No. 12, 439, 01.12.2018.

Research output: Contribution to journalArticle

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